How strict are they? what are the basic for mudflaps and bumper heigth? I looked over one site and what it list flat sucks. bumper has to be 30" and flaps have to come down towith in 10" of the street? Oregon just raised thier mud flap law up to 27" since most stock trucks now were hitting the pervouse setting of 20" it also sas mufflers required , but I wasputtign them back on anyways since the diesel was just too loud for my taste while being open.